Roger Keith Crouch is an American scientist and astronaut who flew as a payload specialist on two NASA Space Shuttle missions in 1997.

A payload specialist (PS) was an individual selected and trained by commercial or research organizations for flights of a specific payload on a NASA Space Shuttle mission. People assigned as payload specialists included individuals selected by the research community, a company or consortium flying a commercial payload aboard the spacecraft, and non-NASA astronauts designated by international partners.